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Model
MDS-NT1
Pages
70
Size
2.74 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
mds-nt1.pdf
Date

Sony MDS-NT1 Service Manual ▷ View online

7
MDS-NT1
SECTION  1
SERVICING  NOTES
The laser diode in the optical pick-up block may suffer electro-
static break-down because of the potential difference generated
by the charged electrostatic load, etc. on clothing and the human
body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
NOTES  ON  LASER  DIODE  EMISSION  CHECK
Never look into the laser diode emission from right above when
checking it for adjustment. It is feared that you will lose your sight.
NOTES  ON  HANDLING  THE  OPTICAL  PICK-UP
BLOCK  OR  BASE  UNIT
(Figure A)
CLEANING  OBJECTIVE  LENS  OF  OPTICAL  PICK-UP
• In cleaning the objective lens of optical pick-up, be sure the
following below.
1. In cleaning the lens, do not apply an excessive force.
As the optical pick-up is vulnerable, application of excessive
force could damage the lens holder.
2. In cleaning, do not use a cleaner other than exclusive cleaning
liquid (KK-91 or isopropyl alcohol).
3. Wipe the objective lens spirally from center toward outside.
(See Figure A)
NOTES ON REPLACING BD BOARD OR MD MECHANISM
DECK
In replacing the BD board or MD mechanism deck, perform the
work through the steps provided below:
1. Remove the IC195 from the BD board to be replaced.
2. Remove the IC195 from new BD board.
3. Mount the IC195 on new BD board, which was removed from
the BD board to be replaced.
4. Install new BD board in the set.
Note:
The IC195 cannot be replaced with a new part. If IC195 is faulty,
replace the entire BD board.
IC195
– BD BOARD (Conductor Side) –
4. Eject the disc, if loaded.
5. Disconnect the power cord from the socket to shut off the power
supply.
OPERATION CHECK IN NORMAL MODE
The set alone is capable of performing the play function only. In
checking the recording and other functions, connect the set to the
PC with a USB cable and perform the operation on the application
software “OpenMG Jukebox” attached.
8
MDS-NT1
I+3V
Iop
GND
TE
FE
VC
RF
I+3V
Iop
GND
TE
FE
VC
RF
1
7
for
MDM-7S2B
I+3V
CN105
Iop
TE
VC
GND
FE
RF
JIG FOR CHECKING BD BOARD WAVEFORM
The special jig (J-2501-149-A) is useful for checking the waveform of the BD board. The names of terminals and the checking items to be
performed are shown as follows.
GND : Ground
I+3V : For measuring Iop (Check the deterioration of the optical pick-up laser)
Iop
: For measuring Iop (Check the deterioration of the optical pick-up laser)
TE
: Tracking error signal (Traverse adjustment)
VC
: Reference level for checking the signal
RF
: RF signal (Check jitter)
FE
: Focus error signal
9
MDS-NT1
Iop DATA RECORDING AND DISPLAY WHEN OPTICAL PICK-UP AND NON-VOLATILE MEMORY (IC195 OF
BD BOARD) ARE REPLACED
The Iop value labeled on the optical pick-up can be recorded in the non-volatile memory. By recording the value, it will eliminate the need
to look at the value on the optical pick-up label. When replacing the optical pick-up or non-volatile memory (IC195 of BD board), record
the Iop value on the optical pick-up according to the following procedure.
Record Procedure:
1. Press the 
[             ]
 button and 
[         ]
 button until the NetMD indicator turns off (for more than 3 seconds). (During this step, the USB
cable must be disconnected)
2. Connect the set to the PC with the attached USB cable.
3. Start up the software for test mode.
4. Click the 
[TEST MODE]
.
5. Click the 
[JOG UP]
 or 
[JOG DOWN]
 to display “[Service]”, and click the 
[ENTER/YES]
.
6. Click the 
[JOG UP]
 or 
[JOG DOWN]
 to display “Iop Write” (C05), and click the 
[ENTER/YES]
.
7. The display becomes “Ref=@@@.@” (@ is an arbitrary number) and the numbers which can be changed will blink.
8. Input the Iop value written on the optical pick-up label.
To select the number : Click the 
[JOG UP]
 or 
[JOG DOWN]
.
To select the digit
: Click the 
[PUSH]
.
9. When the 
[ENTER/YES]
 is clicked, the display becomes “Measu=@@@.@” (@ is an arbitrary number).
10. As the adjustment results are recorded for the 6 value. Leave it as it is and click the 
[PUSH]
.
11. “Complete!” will be displayed momentarily. The value will be recorded in the non-volatile memory and the display will become “Iop
Write (C05)”.
12. Quit the software for test mode after the 
[REPEAT]
 clicked.
Note:
When retrying this operation start from step1.
Display Procedure:
1. Press the 
[             ]
 button and 
[         ]
 button until the NetMD indicator turns off (for more than 3 seconds). (During this step, the USB
cable must be disconnected)
2. Connect the set to the PC with the attached USB cable.
3. Start up the software for test mode.
4. Click the 
[TEST MODE]
.
5. Click the 
[JOG UP]
 or 
[JOG DOWN]
 to display “[Service]”, and click the 
[ENTER/YES]
.
6. Click the 
[JOG UP]
 or 
[JOG DOWN]
 to display “Iop Read” (C26), and click the 
[ENTER/YES]
.
7. “@@.@/##.#” is displayed and the recorded contents are displayed.
@@.@ : indicates the Iop value on the optical pick-up label.
##.#
: indicates the Iop value after adjustment
8. To end, click the 
[PUSH]
 and 
[MENU/NO]
 to display “Iop Read” (C26).
9. Quit the software for test mode after the 
[REPEAT]
 clicked.
Note:
When retrying this operation start from step1.
Note 1:
The test mode and recording of this set are controlled by a personal computer, thus requiring the set to be connected to the PC.
Prepare the personal computer in which necessary software is already installed.
• Attached software “OpenMG Jukebox” (necessary for recording (check in, check out)) (Part No. : 4-237-880-01)
• Software for test mode “TestMode_S.exe”  (“TestMode_S.exe” and essential files “data_files.csv”,  “Net MDUSB.dil” are distributed to-
gether with the Service Manual. For the test mode, copy these three files in the same folder beforehand)
Note 2:
In the operation in the test mode, the operational description requiring “click 
[xxx]
” means that you have to click the button on the screen.
(“xxx” indicates the button name)
B/>
x/Z
B/>
x/Z
10
MDS-NT1
CHECKS PRIOR TO PARTS REPLACEMENT AND ADJUSTMENTS IN MD
Before performing repairs, perform the following checks to determine the faulty locations up to a certain extent.
Details of the procedures are described in “5. Electrical Adjustments”.
Note:
This set uses optical pick-up KMS-262E in the production, but for the repair, only the KMS-262A is supplied. As a result, two types of optical
pick-ups are used for this set, and the specified values for the check and adjustment of the laser power vary depending on the type.Details of the
identify of KMS-262A/KMS-262E are described in “5-4. How to Identify Optical Pick-up KMS-262A/KMS-262E”. (See Page 26)
Note:
 Optical pick-up of repair parts changed to KMS-262E.
• 0.90 mW power
Specified value : 0.84 to 0.92 mW (KMS-262A)
0.90 to 0.96 mW (KMS-262E)
• 8.40 mW power
Specified value : 8.1 to 8.7 mW (KMS-262A)
8.4 to 8.9 mW (KMS-262E)
• Iop (at 8.4mW)
Labeled on the optical pick-up
Iop value 
±
 10mA
• Unsatisfactory if displayed as “NG: XXXX”
NG
(XXXX is arbitrary number)
• Unsatisfactory if displayed as “T=@@ (##) [NG”
NG
(@@, ## are both arbitrary numbers)
Laser power check
(5-7-2 : See page 28)
Auto check
(5-7-4 : See page 29)
Temperature
compensation
offset check
(5-7-1 : See page 28)
Criteria for Determination
(Unsatisfactory if specified value is not satisfied)
• Clean the optical pick-up
• Adjust again
• Replace the optical pick-up
• Replace the optical pick-up
• Replace the optical pick-up
• Check for disconnection of the circuits around
D101 (BD board)
• Check the signals around IC101, IC201, CN102,
CN103 (BD board)
Measure if unsatisfactory:
Note:
The criteria for determination above is intended merely to determine if satisfactory or not, and does not serve as the specified value for adjustments.
When performing adjustments, use the specified values for adjustments.
Ver. 1.3
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